April 2001
Intermediate to advanced
204 pages
5h 10m
English
Content preview from Oracle PL/SQL Best PracticesBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.
DBMS_ JOB
The DBMS_ JOB built-in package offers an API into an Oracle subsystem known as the job queue. The Oracle job queue allows for the scheduling and execution of PL/SQL routines (jobs) at predefined times and/or repeated job execution at regular intervals. DBMS_ JOB provides programs for submitting and executing jobs, changing job execution parameters, and removing or temporarily suspending job execution. And that’s all great, but DBMS_ JOB has several key weaknesses, including:
Little or no job management features. A job is assigned an ID number, but you can’t give your job a name, which makes it hard to locate and manage the job after submission.
Scheduling the frequency of execution can be complicated process. If you want a job to run every Monday, Wednesday, and Friday at noon, for example, you need to pass the following string to DBMS_ JOB.SUBMIT:
'TRUNC(LEAST(NEXT_DAY,(SYSDATE, ''MONDAY''), NEXT_DAY(,(SYSDATE, ''WEDNESDAY''), NEXT_DAY(,(SYSDATE, ''FRIDAY''))) + 1/2'
As with the other built-in packages discussed in this chapter, you can overcome such weaknesses by building your own layer of code around the DBMS_ JOB procedures.
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.